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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>广告</title>
</head>

<body>
    <!-- 头部 -->
    <header class="tac fs18">Slimming tool</header>
    <!-- 主体 -->
    <main>
        <div class="fs14">
            <!-- 倒计时 -->
            <span class="countdown">5</span>
            <span class="xian"></span>
            <span class="skip">跳过</span>
        </div>
        <h1 class="fs36 cwhite tac">-Hello Exerciser-</h1>
    </main>

</body>

</html>